#include <REGX52.H>
void Delay(unsigned int xms);

void main()
{
	while(1)
	{
	if(P3_1 == 0)
	{
		Delay(20);
		while(P3_1 == 0); 
		Delay(20);
		P2_0 = ~P2_0;
			
		 
	}
	}
}

void Delay(unsigned int xms)		//@12.000MHz
{
	unsigned char i, j;
	while(xms)
	{	
		xms--;
		

		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
	}
}
